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"do sexy sandals look ok with nylons?
or do closed courts etc look better "
Depends how horny you feel, stockings are always horny to wear., sandals let you see more of them whereas shoes cover your feet in.
Practically though, your feet slip about inside sandals and can feel really uncomfortable to the point of unsafe, so best to wear nylons only inside court shoes etc. Of course, a nice pair of open toed slingbacks can be ideal, then you get the best of both worlds.
But to answer your question on sandals, look around at what women wear, none of them wear stockings with sandals -- come to think of it, none of them wear stockings anymore!